Lithotrops. That's the name.

The comment by @starfish prime is correct: the consumption of reduced inorganic compounds (RIC) is essential: Energy is derived via oxidation. That is why hydrothermal vents are the main source of RIC. There are no large organisms on Earth feeding on RIC.

Known chemolithotrophs are exclusively microorganisms; no known macrofauna possesses the ability to use inorganic compounds as energy sources. Macrofauna and lithotrophs can form symbiotic relationships, in which case the lithotrophs are called "prokaryotic symbionts"

It is possible, however, that larger organisms develop a symbiotic relationship with those microorganisms. One good solution to your large human-like creatures living on land is to live close to volcanoes. They live on a geologically-active planet with abundant sulfur vents. They eat sulfur deposits and derive energy by oxidizing sulfur to sulfates. The energy drives growth and metabolism that uses additional minerals as building blocks. Also, by saying "inorganic" you exclude carbon almost completely. Are you envisaging silicon-based life?

Lithotrops. That's the name.

The comment by @starfish prime is correct: the consumption of reduced inorganic compounds (RIC) is essential: Energy is derived via oxidation. That is why hydrothermal vents are the main source of RIC. There are no large organisms on Earth feeding on RIC.

Known chemolithotrophs are exclusively microorganisms; no known macrofauna possesses the ability to use inorganic compounds as energy sources. Macrofauna and lithotrophs can form symbiotic relationships, in which case the lithotrophs are called "prokaryotic symbionts"

It is possible, however, that larger organisms develop a symbiotic relationship with those microorganisms. One good solution to your large human-like creatures living on land is to live close to volcanoes. They live on a geologically-active planet with abundant sulfur vents. They eat sulfur deposits and derive energy by oxidizing sulfur to sulfates. The energy drives growth and metabolism that uses additional minerals as building blocks. Also, by saying "inorganic" you exclude carbon almost completely. It is possible to absorb carbon dioxide for biosynthesis rather that handwaving a silicon-based life